package net.wanho.controller;

import lombok.RequiredArgsConstructor;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Author：汤小洋
 * Date：2025-07-29 11:02
 * Description：<描述>
 */
@RestController
@RequiredArgsConstructor
public class LockController {

    private final StringRedisTemplate redisTemplate;
    private final RedissonClient redissonClient;

    @RequestMapping("/deductStock")
    public String deductStock() {
        System.out.println(Thread.currentThread().getName()+"线程正在下单---------------------");

        String lockName = "stock_lock";
        RLock rLock = redissonClient.getLock(lockName);
        rLock.lock(); // 加锁

        // synchronized (this){
        int total = Integer.parseInt(redisTemplate.opsForValue().get("stock"));
        if (total > 0){

            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }

            total = total - 1;
            redisTemplate.opsForValue().set("stock",total + "");

            rLock.unlock(); // 释放锁
            return "下单成功，库存剩余：" + total;
        }
        // }
        rLock.unlock(); // 释放锁

        return "下单失败，库存不足";
    }

}
